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Hi all. I've not used my li-ion batteries for a good few months and they now won't hold any charge. At first I thought it was the charger as none would charge, but trying a different charger I'm getting the same problem. I've seen that you can boost them but not really sure what that entails. I don't really want to dump and replace them as I don't do much installation work so don't use them often enough (hence why I just went for ryobi rather than more expensive). Any advice please?